*
    margin 0
    padding 0

body 
    font-family -apple-system,Arial,snas-serif
    background #f4f4f4
    padding 2rem

.app
    max-witdth 600px
    margin 0 auto 
    background white
    padding 2rem
    border-raiuds 0.5rem
    box-shadow 0 2px 6px rgba(0,0,0,0.1)

.header
    text-align center
    